Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa606b3cfc09f69…

MALICIOUS

PDF

75.1 KB Created: 2021-09-07 14:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4003593de7b556acd3ed1fe24c0fe854 SHA-1: 91715f33b7d9de5cfc033caf58beb5adf739e86b SHA-256: eaa606b3cfc09f69d4b9df73c09ac67b35fe338972c3996d71f6b00557f7c821
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://intekcanada.com/ckfinder/userfiles/files/kikokadobuvogasopufe.pdf In PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/mrqmkl0317tqpmf9mec56k1qrj/94061768804.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/bdcc32bb76f32ef67b10de8a2158b260/47208821736.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607af263781ba---xifizomimobax.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/lufuriba.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/mefovisupi.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1cac045a082b690ef35da4d238d5bed2/sudowixuriteker.pdfIn PDF document text
    • https://longhoang.vn/upload/files/66917668949.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/51389513277.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/40nqohhvihsedjbbrj7pnqa876/wasulusitafet.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/19082569323.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/wevow.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/11749663139.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2d60ece15---mubeneta.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/73143390964.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/87451178306.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/dec48a918d84555fdaf2a594eef1ac99/7861741616.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2523c1361a3b17b6197d817d7adfce62/sonupitebonoxexovamamal.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/oo29fcd6cc36vp45gkfmovs4eb/siribevikubebodozesu.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/revizenagirajage.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/16647347332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=english+file+a2%2Fb1+fourth+edition+pdf+descargar+gratisPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE76 17708 bytes
SHA-256: 33fde2c9f30f426cfa00c2e70e776296d660e46853572e301e7c8e691bcd38d0
font_01_sfnt_off0000ebda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F1 11328 bytes
SHA-256: bb86ac4480f7d3332cf57a3161abcc096a8cc67be5bf2ac3a20b7fba2518b90a

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